Vanadium Modified LiFePO[sub 4] Cathode for Li-Ion Batteries

Abstract

The structure and electrochemical behavior of vanadium-modified olivine was investigated. Vanadium was found to be incorporated into the olivine structure on the phosphorus site, not on the iron site, with the unit cell decreasing in size as the vanadium content increases. Material synthesized under reducing conditions with 5% vanadium gave materials with the best electrochemical performance. The rate capability of nanostructured was comparable to the best nanosized formed solvothermally while using less than the amount of carbon conductor. The vanadium does not appear to be electrochemically active within the voltage cycling window of .